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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1868 Excerpt: ...of the parelectronomy can take place in individual muscles, cut off from the influence of the circulation of the blood and the nervous system, when they are exposed to a low temperature: for, so far, the parelectronomic muscles we have experimented upon have always been taken from living animals that had been exposed in their entity to the action of the cold. The result of experiment is unfavorable to this conclusion. The description, given on page 294, of the appearance presented by a frog that had been kept for some time at a temperature near the freezing point of water, being the same as that given by Barkow of that of frogs during their winter sleep, no doubt can be entertained that the higher development of parelectronomy must henceforth be considered as a new phenomenon of the winter-sleep of coldblooded animals. It is probable, however, that the warm-blooded hibernating animals also exhibit this same phenomenon, since, as is well known, their animal heat depends on the temperature of the surrounding medium to a very much greater extent than is the case with the other warm-blooded non-hibernating animals. It may be asked whether, since temperature decrease causes a further development of the parelectronomic layer, temperature increase will not cause it to retrograde? Du Bois Reymond never succeeded in showing experimentally any such effect of heat per se; but he has shown that Matteucci is in error when he asserts, that a frozen frog needs only to be placed in lukewarm water to have his muscles restored to their ordinary state. Thus, a cooled frog being placed in warm water, whose temperature was raised in the course of the first half hour from 12 to 30, and in the next, up to 37 C, fell on his back with hurried breathing and enlarged pupils, and yet ...

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